ITEM NO: JDCD3310 The two-part alternator socket allows easy removal and replacement of the free-wheel drive pulley at the alternator This tool allows the alternator to be locked by the M10 spline bit socket insert and enables the central locking bolt of the pulley to be loosened or tightened by the serrated reaction nut Use with 17mm wrench 33 teeth hexagonal reaction nut, O.D. 19.5mm Applications: BMW, VW, Audi, Ford, Skoda, Mercedes, Porsche, Renault and etc.